Re: Debian compiz screen tearing

[Doug Mohan <mohan.doug@gmail.com>]

Hi Carlos,

I do have these settings properly set.  The bug isn't really with 
tearing on the main screen.  It is with tearing on the non-primary screen.

I have the second screen set up as a separate X server running to my 
TV.  The tearing only occurs on the second X screen.

If I make my second screen the primary screen it works fine, but then my 
main monitor (which has then changed to the second x server) gets tearing.

I read something about this being a timing issue between the two X servers.

This bug does not occur with any .9x versions, including the version in 
experimental.  There are just other things missing with the experimental 
version.

Supposedly there is a workaround in .86 that fixes this, but again that 
version is not available for debian.

Any chance that there can be a fix for .84, or possibly a more completed 
version of .9x in experimental or unstable.

This is the only thing keeping me from using my old trust debian distro.

BTW - the tearing on the second monitor does not occur if I set it up as 
"cloned / twinview" - only if it is set up as a seperate X server.  This 
, however, in my instance, is not how I use the second screen.  I need 
it as a seperate X instance.

Please let me know your thoughts.

Thanks for your help,

DuG


On 11/22/2012 04:30 AM, Carlos Alberto Lopez Perez wrote:
> On 21/11/12 01:40, Doug Mohan wrote:
> > Gentlemen,
> >
> > I would like to report a bug in debian compiz 0.84.  I run multiple
> > monitors, each with a separate desktop.
> >
> > Watching videos on my main desktop is fine, but watching them on my
> > second screen results in screen tearing.  Using Nvidia GTX 550 card.
> >
> > This is widely reported, and is fixed in the .9 series and I believe has
> > a workaround in the .86 series.
> >
> > Is there any chance of a bug fix making it into wheezy, or possibly
> > updating the .92 version in experimental or moving something newer to
> > unstable?
> >
> > Please let me know.  At the moment I have switched to linux mint to see
> > how newer versions work, and they work without issue.  Still, I would
> > much rather be running debian stable.  I really am used to compiz over
> > the years though, and do not want to go without.
> >
> > BTW - running XFCE 4.8.
> >
> > Please respond and let me know what my options are.  I have tried
> > compiling from source as well as many searches on the net, but have had
> > no luck.  Seems the compiz main page is very out of date and not very
> > helpful either.
> >
> > Thanks for your response,
> >
> > Doug
> Please check that you have you have enabled the option to sync to vblank.
> To check if this is working or not just execute glxgears, it should
> report the same FPS as your monitor Hz (60 typically).
>
> $ glxgears
> Running synchronized to the vertical refresh.  The framerate should be
> approximately the same as the monitor refresh rate.
> 300 frames in 5.0 seconds = 60.000 FPS
> ...
>
>
> If you don't have it enabled, the way to enable it under compiz is:
>
> * Install the package compizconfig-settings-manager.
> * Execute ccsm.
> ** Under the category General, select General Options. Select the
> Display Settings tab. De-select the Detect Refresh Rate option. Set the
> Refresh Rate option to match the vertical refresh rate of your display.
> (I checked my monitor’s on-screen display to verify that it was running
> 60 Hz.) Finally, select the Sync To VBlank option.
>
> This should fix the issue
>
>
> Regards!